My ROM always freezes right in the middle of your first battle, when you first get your Medabot. Here's the kicker, I already applied the anti-piracy patch from this thread: http://forum.romulation.net/index.php?topic=42157.msg791781#msg791781 So, what do I do? I have an AceKard 2 that's running the most recent AKAIO firmware (or at least the firmware that was released around the same time as WarioWare D.I.Y.) by the way.
There is now AKAIO 1.7. Upgrade to that if you can use it. I'm not sure of the overall compatibility with AKAIO though for the Acekard 2.